Appendix E Spectroscopy-Mount and Spectrograph Adapters 205
Short focal-length spectrographs: there is generally a focusing mechanism
on the spectrograph itself which, when adjusted, will move the optics as required
to achieve proper focus.
No focusing adjustment: If there is no focusing adjustment, either provided
by the spectrograph or by the mounting hardware, then the only recourse will be
to adjust the spectrograph’s focusing mirror or to shim the detector.
5. Next adjust the rotation. You can do this by rotating the detector while watching a
live display of the line. The line will go from broad to narrow and back to broad.
Leave the detector rotation set for the narrowest achievable line.
Alternatively, take an image, display the horizontal and vertical cursor bars, and
compare the vertical bar to the line shape on the screen. Rotate the detector until the
line shape on the screen is parallel with the vertical bar.
Note: When aligning other accessories, such as fibers, lenses, optical fiber adapters, first
align the spectrograph to the slit. Then align the accessory without disturbing the detector
position. The procedure is identical to that used to focus the spectrograph, i.e. do the
focus and alignment operations while watching a live image.
Table 14. Spectrograph Adapters
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